Whistler-Mode Waves Observed by the DEMETER Spacecraft and the Kannuslehto Station: Spatial Extent and Propagation to the Ground

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10485690" target="_blank" >RIV/00216208:11320/24:10485690 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=_BcMnfPbVX" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=_BcMnfPbVX</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2024JA032802" target="_blank" >10.1029/2024JA032802</a>

Result language

angličtina

Original language name

Whistler-Mode Waves Observed by the DEMETER Spacecraft and the Kannuslehto Station: Spatial Extent and Propagation to the Ground

Original language description

We use conjugate observations of magnetospheric whistler-mode waves at frequencies up to 16 kHz by the DEMETER spacecraft (at an altitude of approximately 660 km) and the ground-based Kannuslehto station in Finland (L approximate to 5.38) $(Lapprox 5.38)$ to investigate the wave propagation to the ground and their characteristic spatial scales. For this purpose, we evaluate correlations between the wave intensities measured by the spacecraft and the ground-based station at various frequencies as a function of their longitudinal and L-shell separations. Two different approaches are used: (a) direct correlation of wave intensities measured at the same times and (b) correlation of wave intensities within corresponding frequency-time windows, focusing on the identification of the same frequency-time wave signatures. We show that the characteristic longitudinal scales of the investigated waves are between about 60 degrees $60{}&lt;^&gt;{circ}$ and 90 degrees $90{}&lt;^&gt;{circ}$. We further demonstrate that, while the wave intensities measured by DEMETER are generally larger during periods of enhanced geomagnetic activity, wave intensities measured on the ground during increased activity are only slightly larger during the daytime and decrease during the nighttime. Overall correlations of whistler-mode wave intensities at low altitudes (660 km) and on the ground are evaluated for the first time Characteristic longitudinal scales of observed waves are approximately between 60 and 90 degrees Nighttime wave intensities measured on the ground are lower during geomagnetically active periods

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

<a href="/en/project/GA21-01813S" target="_blank" >GA21-01813S: Anthropogenic electromagnetic emissions and their effects on the Earth’s inner magnetosphere</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Geophysical Research. Space Physics

ISSN

2169-9380

e-ISSN

2169-9402

Volume of the periodical

129

Issue of the periodical within the volume

9

Country of publishing house

US - UNITED STATES

Number of pages

12

Pages from-to

e2024JA032802

UT code for WoS article

001310397100001

EID of the result in the Scopus database

2-s2.0-85203981164